Dawei Shen
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View article: Surface reconstruction and orthogonal decoupling in SrAl4 and EuAl4
Surface reconstruction and orthogonal decoupling in SrAl4 and EuAl4 Open
Surface-induced symmetry breaking in quantum materials can stabilize exotic electronic phases distinct from those in the bulk, yet its momentum-space manifestations remain elusive due to domain-averaging effects. Here, using angle-resolved…
View article: Ambient-pressure superconductivity and electronic structures of engineered hybrid nickelate films
Ambient-pressure superconductivity and electronic structures of engineered hybrid nickelate films Open
Ruddlesden-Popper (RP) nickelates have emerged as a crucial platform for exploring the mechanisms of high-temperature superconductivity. However, the Fermi surface topology required for superconductivity remains elusive. Here, we report th…
View article: LiveMCP-101: Stress Testing and Diagnosing MCP-enabled Agents on Challenging Queries
LiveMCP-101: Stress Testing and Diagnosing MCP-enabled Agents on Challenging Queries Open
Tool calling has emerged as a critical capability for AI agents to interact with the real world and solve complex tasks. While the Model Context Protocol (MCP) provides a powerful standardized framework for tool integration, there is a sig…
View article: Observation of superconductivity-induced leading-edge gap in Sr-doped $\mathrm{La}_{3}\mathrm{Ni}_{2}\mathrm{O}_{7}$ thin films
Observation of superconductivity-induced leading-edge gap in Sr-doped $\mathrm{La}_{3}\mathrm{Ni}_{2}\mathrm{O}_{7}$ thin films Open
The discovery of high-temperature superconductivity in pressurized bulk $\mathrm{La}_{3}\mathrm{Ni}_{2}\mathrm{O}_{7}$ has ignited significant interest in nickelate superconductors. Unlike cuprates, where superconductivity predominantly or…
View article: Unconventional band splitting of CeSb in the devil’s staircase transition
Unconventional band splitting of CeSb in the devil’s staircase transition Open
The interplay between magnetism and electronic band structure is a central theme in condensed matter physics. CeSb, with its complex devil’s staircase antiferromagnetic transition, offers a unique opportunity to explore this interplay. Usi…
View article: Revealing the electron-spin fluctuation coupling by photoemission in CaKFe4As4
Revealing the electron-spin fluctuation coupling by photoemission in CaKFe4As4 Open
Electron-boson coupling in unconventional superconductors is one of the key parameters in understanding the superconducting pairing symmetry. Here, we report definitive photoemission evidence of electron-spin exciton coupling in the iron-b…
View article: Electronic structure of superconducting infinite-layer lanthanum nickelates
Electronic structure of superconducting infinite-layer lanthanum nickelates Open
Revealing the momentum-resolved electronic structure of infinite-layer nickelates is essential for understanding this class of unconventional superconductors but has been hindered by the formidable challenges in improving the sample qualit…
View article: Tunable Mirror‐Symmetric Type‐III Ising Superconductivity in Atomically‐Thin Natural Van der Waals Heterostructures
Tunable Mirror‐Symmetric Type‐III Ising Superconductivity in Atomically‐Thin Natural Van der Waals Heterostructures Open
Van der Waals (vdW) crystals with strong spin‐orbit coupling (SOC) provide great opportunities for exploring unconventional 2D superconductors, wherein new pairing states emerge due to the interplay of SOC with crystalline symmetries, elec…
View article: Electronic and magnetic excitations in La3Ni2O7
Electronic and magnetic excitations in La3Ni2O7 Open
High-temperature superconductivity was discovered in the pressurized nickelate La3Ni2O7 which has a unique bilayer structure and mixed valence state of nickel. The properties at ambient pressure contain crucial information of the fundament…
View article: Observation of floating surface state in obstructed atomic insulator candidate NiP2
Observation of floating surface state in obstructed atomic insulator candidate NiP2 Open
Obstructed atomic insulator is recently proposed as an unconventional material, in which electric charge centers localized at sites away from the atoms. A half-filling surface state would emerge at specific interfaces cutting through these…
View article: Absence of altermagnetic spin splitting character in rutile oxide RuO$_2$
Absence of altermagnetic spin splitting character in rutile oxide RuO$_2$ Open
Rutile RuO$_2$ has been posited as a potential $d$-wave altermagnetism candidate, with a predicted significant spin splitting up to 1.4 eV. Despite accumulating theoretical predictions and transport measurements, direct spectroscopic obser…
View article: Unveiling the charge density wave mechanism in vanadium-based Bi-layered kagome metals
Unveiling the charge density wave mechanism in vanadium-based Bi-layered kagome metals Open
The charge density wave (CDW), as a hallmark of vanadium-based kagome superconductor AV 3 Sb 5 (A = K, Rb, Cs), has attracted intensive attention. However, the fundamental controversy regarding the underlying mechanism of CDW therein persi…
View article: Surface-sensitive electronic structure of kagome superconductor CsV<sub>3</sub>Sb<sub>5</sub>
Surface-sensitive electronic structure of kagome superconductor CsV<sub>3</sub>Sb<sub>5</sub> Open
We systematically study the electronic structure of a kagome superconductor CsV 3 Sb 5 at different temperatures covering both its charge density wave state and normal state with angle-resolved photoemission spectroscopy. We observe that t…
View article: Switchable anomalous Hall effect by selective mirror symmetry breaking in a kagome magnet GdMn6Ge6
Switchable anomalous Hall effect by selective mirror symmetry breaking in a kagome magnet GdMn6Ge6 Open
The crystal symmetry plays a pivotal role in protecting the nontrivial electronic states in a topological phase. Manipulation of the crystal symmetry and hence the nontrivial topological states would serve as a fertile ground to explore ex…
View article: Evidence of electron interaction with an unidentified bosonic mode in superconductor CsCa2Fe4As4F2
Evidence of electron interaction with an unidentified bosonic mode in superconductor CsCa2Fe4As4F2 Open
The kink structure in band dispersion usually refers to a certain electron-boson interaction, which is crucial in understanding the pairing in unconventional superconductors. Here we report the evidence of the observation of a kink structu…
View article: Observation of floating surface state in obstructed atomic insulator candidate NiP2
Observation of floating surface state in obstructed atomic insulator candidate NiP2 Open
Obstructed atomic insulator is recently proposed as an unconventional material, in which electric charge centers localized at sites away from the atoms. A half-filling surface state would emerge at specific interfaces cutting through these…
View article: Flat bands and distinct density wave orders in correlated Kagome superconductor CsCr$_3$Sb$_5$
Flat bands and distinct density wave orders in correlated Kagome superconductor CsCr$_3$Sb$_5$ Open
Kagome metal CsV$_3$Sb$_5$ has attracted much recent attention due to the coexistence of multiple exotic orders and the associated proposals to mimic unconventional high temperature superconductors. Nevertheless, magnetism and strong elect…
View article: Nonlinear optical signatures of topological Dirac fermion
Nonlinear optical signatures of topological Dirac fermion Open
Dirac fermion in topological materials exhibits intriguing nonlinear optical responses. However, their direct correlation with the linearly dispersed band remains elusive experimentally. Here, we take topological semimetal ZrSiS as a parad…
View article: Observation of floating surface state in obstructed atomic insulator candidate NiP$_2$
Observation of floating surface state in obstructed atomic insulator candidate NiP$_2$ Open
Obstructed atomic insulator is recently proposed as an unconventional material, in which electric charge centers localized at sites away from the atoms. A half-filling surface state would emerge at specific interfaces cutting through these…
View article: Unconventional anomalous Hall effect and large anomalous Nernst effect in antiferromagnet SmMnBi2
Unconventional anomalous Hall effect and large anomalous Nernst effect in antiferromagnet SmMnBi2 Open
The anomalous Hall effect (AHE) and its thermoelectric counterpart, the anomalous Nernst effect (ANE), are two transverse transport coefficients that are intensely studied in condensed matter physics. While conventional wisdom links AHE an…
View article: Excess PbI2 Management via Multimode Supramolecular Complex Engineering Enables High-Performance Perovskite Solar Cells
Excess PbI2 Management via Multimode Supramolecular Complex Engineering Enables High-Performance Perovskite Solar Cells Open
Excess PbI2 in perovskite film is an effective strategy for boosting perovskite solar cells (PSCs) performance. However, the presence of unreacted PbI2 is a critical source of intrinsic instability in perovskite under illumination, due to …
View article: Large band-splitting in $g$-wave type altermagnet CrSb
Large band-splitting in $g$-wave type altermagnet CrSb Open
Altermagnetism (AM), a newly discovered magnetic state, ingeniously integrates the properties of ferromagnetism and antiferromagnetism, representing a significant breakthrough in the field of magnetic materials. Despite experimental verifi…
View article: Exterior stability of Minkowski spacetime with borderline decay
Exterior stability of Minkowski spacetime with borderline decay Open
In 1993, the global stability of Minkowski spacetime has been proven in the celebrated work of Christodoulou and Klainerman \cite{Ch-Kl}. In 2003, Klainerman and Nicolò \cite{Kl-Ni} revisited Minkowski stability in the exterior of an outgo…
View article: Exploring Fermi Surface Nesting and the Nature of Heavy Quasiparticles in the Spin-Triplet Superconductor Candidate CeRh$_2$As$_2$
Exploring Fermi Surface Nesting and the Nature of Heavy Quasiparticles in the Spin-Triplet Superconductor Candidate CeRh$_2$As$_2$ Open
In this study, we investigate the electronic structure of a spin-triplet superconductor candidate CeRh$_2$As$_2$ using high-resolution angle-resolved photoemission spectroscopy and density functional theory calculations. Notably, Fermi sur…
View article: Strain-induced modulation of electronic structure in correlated Dirac semimetal Pv-CaIrO3 epitaxial thin films
Strain-induced modulation of electronic structure in correlated Dirac semimetal Pv-CaIrO3 epitaxial thin films Open
Perovskite CaIrO3 is theoretically predicted to be a Dirac node semimetal near the Mott transition, which possesses a considerable interplay between electron correlations and spin–orbit coupling. Electron correlations can significantly tun…
View article: CircRNA-Pro: A Novel Toolkit for High-Precision Detection of Differentially Expressed Circular RNAs and Translatable Circular RNAs
CircRNA-Pro: A Novel Toolkit for High-Precision Detection of Differentially Expressed Circular RNAs and Translatable Circular RNAs Open
With the increasing discovery of circular RNAs (circRNAs) and their critical roles in gene regulation and disease progression, there is a growing need for more accurate and efficient tools for circRNAs research. In response, we have develo…
View article: Emergence of quantum confinement in topological kagome superconductor CsV3Sb5
Emergence of quantum confinement in topological kagome superconductor CsV3Sb5 Open
Quantum confinement is a restriction on the motion of electrons in a material to specific region, resulting in discrete energy levels rather than continuous energy bands. In certain materials, quantum confinement could dramatically reshape…
View article: Electronic Structure of Superconducting Infinite-Layer Lanthanum Nickelates
Electronic Structure of Superconducting Infinite-Layer Lanthanum Nickelates Open
Revealing the momentum-resolved electronic structure of infinite-layer nickelates is essential for understanding this new class of unconventional superconductors, but has been hindered by the formidable challenges in improving the sample q…